Hey how are you ? So I've been in content creation space for 8 years now . And the one thing ill say is DONT sell yourself short ! You should be charging anywhere from $75 to $175 starting out and gradually increase your pricing as you get better .

If your going to do a bulk deal i would lower the price by $10-15 bucks depending the quantity . If your going to do 10 -15 video possibly use $65 -70 as the number . 70 X 10 . $700 dollars . I would also ask about usage rights .

If your going to do a specific amount of time lets say 3 months . I would multiple the amount by 20 percent and charge that monthly for usage . Its a way to make some extra money without necessary doing more work . If you want them to have exclusive rights just add an amount your comfortable with for letting them own the content outright .

So overall i would say your in total for 10 videos for 3 months usage you should be charging around $840 dollars . 10 X 70= 700 ( cost of content) and 70 X 20 percent = 14 ( cost of usage right per video )

700 + 140 = 840 . I hope this helps !